FA testers were due to turn up at their training centre and Sanchez was one of the random names pulled out for testing.

But Arsenal, who are supposed to inform the FA of any changes to their training schedules each day, appear to have overlooked Sanchez’s absence in an admin blunder.

There is no suggestion he tried to evade a test and it is unlikely he would even have known where he should have been that day for testing purposes — clubs usually take responsibility for
telling the authorities of their players’ whereabouts.